Thermal Death Studies of Third-Instar Caribbean Fruit Fly (Diptera: Tephritidae)

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Laboratory tests examined mortality of 3rd-instar Caribbean fruit fly, Anastrepha suspensa (Loew), exposed to 40°C in water baths. Larvae chilled to 4°C before treatment had similar percentage survival (94%) as larvae held at ambient temperature (≍25°C) after exposure to 40°C for 10 min. Significant differences for percentage survival were found between larvae exposed for various durations in sealed metal tubes with rearing diet and larvae exposed in fabric-sleeved cylinders with no diet. Submersion of larvae for 2 h in water at ≍25°C before treatment in a 40°C water bath for 67 min did not influence survival. When larvae were exposed to 40°C for 67 min in empty tubes (no diet), larval cohorts at low densities (32 ± 14 larvae per tube) had higher survival (85.8%) than survival (19.4%) of larvae treated at higher densities (361 ± 155 larvae per tube). Temperature regimes alone did not explain larval mortality. Other factors such as larval density, substrate, and environmental factors could contribute to mortality.

Document Type: Research Article

Publication date: August 1, 1998

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